Two Mortar shells struck a school complex in central Damascus on Tuesday, killing at least 12 people and wounding dozens, state media and a monitoring group said. The attack in the mainly Shi'ite Muslim district of Shaghour came a day after President Bashar al-Assad **minated himself to stand for re-election, in defiance of calls for him to step aside and allow a political solution to Syria's civil war. Residents said the Badr el-Din Husseini complex which was hit is attended by both primary and secondary school students. State news agency SANA said 12 people were killed but the Britain-based Syrian Observatory for Human Rights, which monitors the violence in Syria, put the death count at 13.